Chimney draft control



ct. 4, 3949. J. H. MESSER CHIMNEY DRAFT CONTROL Filed Sept. 5, 194a INVENTOR R E S 5 E.

ATTORNEY Patented Oct. 4, 1949 UNITED STATES PATENT OFFICE CHIMNEY DRAFT CONTROL John H. Messer, Pittsburgh, Pa.

Application September 5, 1946, Serial No. 694,840

1 Claim.

This invention relates to, a draft control for chimneys, and important objects and advantages thereof are to provide a draft control of the character described, which will assure regular and proper draft action in the chimney regardless of the position or location of the latter, which will minimize smoke and completely eliminate backdraft, which will stimulate and promote combustion, which will prevent the entrance of rain, snow and other weather elements into the flue channels, which is simple in its construction and arrangement, durable and efficient in its use, compact, attractive in appearance, positive in its action, and comparatively economical in its manufacture, installation, operation, and maintenance.

To the accomplishment of these and such other objects as may hereinafter appear, the invention resides in the novel construction, combination, and arrangement of parts herein specifically described and illustrated in the accompanying drawing, but it is to be understood that changes in the form, proportions, and details of construction may be resorted to that come within the scope of the claims hereunto appended.

In the drawin wherein like numerals of reference designate corresponding parts throughout the several views:

Figure l is a side elevational view, partly in section of a draft control, constructed in accordance with the invention, and mounted in position on the top of a chimney.

Figure 2 is a top plan view of the draft control.

Figure 3 is a side elevational view of a modified form of draft control embodying the present invention.

Referrin in detail to the drawing 1 denotes a rectangularly shaped sheet metal base including depending side flanges 2, by which latter the base is secured in position on the top of a correspondingly shaped chimney 3.

The base I is provided with an opening 4, which is surrounded by an upwardly projecting attaching neck 5. The base opening 4 is of a size approximating the transverse area of the chimney flue channel 6, and is disposed in registration with the latter when the base is mounted in position on the chimney 3.

A comparatively large outer shell I, and a relatively small inner shell 8 are mounted on the base I. The shells l and 8 are substantially coneshaped, tapering toward their upper ends, and are arranged in concentric relation to each other to provide a considerable clearance 9 therebetween. 'I'he shells l and 8. are open at both ends, and the 2 outer shell 7 projects considerably above the top of the inner shell 8.

The outer shell 1 is secured to the base I by a plurality of connecting lugs l0, which are preferably stamped from the base and attached to the lower end of the outer shell 1 by welding or in any other suitable manner. The inner shell 8 is secured to the base by engaging the lower end of said shell 8 on the attachin neck 5.

The large outer shell 1 is provided with a plurality of compartively large exit openings H, which are disposed in the lower end portion thereof, and which are preferably positioned in regularly spaced relation to each other.

The shells l and 8 are constructed of sheet metal, and while herein shown as being circular in transverse section, it will be obvious that such contour of said shells may be square, hexagon, or any other desired polygonal configuration without departing from the spirit of the invention.

In the use of the improved device, draft action is stimulated to promote combustion by the circulation of air inwardly through the openings H, and upwardly though the clearance 9 and through the projecting upper end portion of the outer shell 1. Unless snow, rain, or sleet are descending in the exact perpendicular direction, which is most unusual, the use of the device will cause the deflection of such weather elements, to prevent the entrance of the latter into the flue channel 6, by functioning to direct said elements into and though the clearance 9 to be discharged through the openings II in the outer shell 1.

In the event of downdraft or backdraft, the products of combustion emanatin from the flue channel 6, by the function of the device will be directed through the clearance 9 between the shells 1 and 8 to be dissipated through the openings II in the outer shell 1, whereby draft action is properly maintained regardless of weather conditions.

The embodiment of the invention, shown in Figure 3, comprises a cone-shaped outer shell l2 provided with base openings I 3, and a spaced, similarly shaped inner shell M. The shells l2 and M are secured to a flanged circular base Hi to adapt the device for mounting on the top of a cylindrical type of smoke stack l8.

In employing the device in connection with heaters and furnaces using gas fuel, a cap I! is detachably mounted in spaced relation on the top of the inner shell by means of supportin clips Hi, to prevent the entrance of extraneous matter into the flue channel, and to deflect and expel back draft through the outer shell side openings.

The present invention provides a most efficient device of its kind, which may be economically manufactured, and successfully employed for the purposes and in the manner herein set forth.

What I claim is:

A draft control for a chimney comprising the combination of a, flat base provided with an opening registering with the chimney channel, side flanges depending from said base for securin the latter to the top of the chimney, an upwardly extending attaching neck forming the wall of said opening, a cone-shaped inner shell open at both ends and having the lower enlarged end thereof secured to said neck, a cone-shaped outer shell surrounding said inner shell in concentric spaced relation to the latter, a plurality of connecting lugs stamped from said base and being attached to said outer shell for securing the latter to said base, said outer shell being provided with a phi-- rality of draft openings in the lower portion of the wall thereof, the top of said outer shell projecting above the top of said inner shell, a cap for said inner shell disposed withinv the upper end of said outer shell, and a plurality of clips for supporting said cap on: the upper end of saidinner shell in spaced relation to the top of the latter.

JOHN H. MESSER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 10 Number Name Date 50,356 Henriksen Oct. 10, 1865 77,047 Jauss Apr. 21, 1868 256,194 Blackman Apr. 11, 1882 515,574 Coles Feb. 27, 1894 2,074,291 White Mar. 16, 1937 2,319,884 Robbins May 25, 1943 FOREIGN PATENTS Number Country Date 28 Great Britain 1863 275 Great: Britain 1867 5,261 Great Britain c- ..c. 1898 5,845 Great Britain 1884 9,362 Great Britain -s a... 1906 

